影响螺杆空压机实际排气量的因素

Factors Influencing Actual Exhaust Volume of Screw Air Compressor

1.设备转速：

1. Equipment speed:

螺杆空压机的排气量与转速成正比，而转速往往会随电网的电压、频率而变化。当电压降低或频率降低时，转速将下降，使螺杆空压机排气量减少。

The exhaust volume of screw air compressor is proportional to the rotational speed, and the rotational speed often varies with the voltage and frequency of power grid. When the voltage or frequency decreases, the speed will decrease, which will reduce the exhaust volume of screw air compressor.

2.吸气状态：

2. Inhalation state:

螺杆空压机是容积型压缩机，吸气体积不变。当吸气温度升高，或吸气管路阻力过大而使吸入压力降低时，气体的密度减小，相应地会减少螺杆空压机排气量；

Screw air compressor is a volumetric compressor with constant gas absorption volume. When the suction temperature increases or the suction pressure decreases due to the excessive resistance of the suction pipeline, the density of the gas decreases and the exhaust volume of the screw air compressor decreases accordingly.

3.气体泄漏：

3. Gas leakage:

转子相互之间及转子与外壳之间在运转时没有接触，保持有一定的缝隙，所以会产生气体泄漏。压力升高后的气体通过缝隙向吸气管道及正在吸气的啮槽泄漏时，将使排气量减小。为了减少泄漏量，在从动转子的齿顶做有密封齿，主动转子的齿根开有密封槽，端面也加工有环状或条状的密封齿。如果这些密封线磨损，将使泄漏量增加，因此平时维护的时候应该考虑到这些因素；

There is no contact between the rotors and between the rotors and the outer shell during operation, and there is a certain gap, so gas leakage will occur. When the pressure rises and the gas leaks through the gap to the suction pipe and the suction groove, the exhaust volume will decrease. In order to reduce leakage, sealing teeth are made on the top of the driven rotor teeth, sealing grooves are opened on the root of the active rotor teeth, and ring or strip sealing teeth are machined on the end face. If these sealing wires are worn out, the leakage will increase, so these factors should be taken into account in maintenance.

4.冷却效果：

4. Cooling effect:

气体在压缩过程中温度会升高，转子与机壳的温度也相应升高，所以在吸气过程中，气体会受到转子和机壳的加热而膨胀，因此相应地会减少吸气量。螺杆式空气压缩机的转子中有的采用了油冷却，机壳用水冷却，其目的之一就是为了降低其温度。当冷却效果不好时，温度则升高，螺杆空压机排气量便会减少。

During the compression process, the temperature of the gas will rise, and the temperature of the rotor and the casing will also rise accordingly. Therefore, during the suction process, the gas will expand due to the heating of the rotor and the casing, so the suction capacity will be reduced accordingly. Oil cooling is used in the rotor of screw air compressor and water cooling is used in the casing. One of its purposes is to reduce its temperature. When the cooling effect is not good, the temperature rises and the exhaust volume of screw air compressor decreases.